Vetus Bow Thruster 95 kgf 12 V Tunnel 185 mm

The Vetus 95 Kgf Bow Thruster tunnel 185 mm is suitable for Yachts and Powerboats up to 17m (56 ft). Manufactured using the highest quality materials to give high power and long service life.

Key benefits of a Vetus Bow Thruster are :

1. High quality, high output 12v DC motor.
2. Bronze streamlined lower leg.
3. Single 6 Blade propeller – specially designed with MARIN to give 9% more thrust – equal in both directions with less cavitation and less tunnel noise.
4. Flexible drive coupling – no shear pin.
5. Multi-Station control options with simple wiring.
6. World-Wide reputation.

This model is designed to be a compatible replacement for older Vetus BOW80 4.7kW units.

Bow Thruster 95 kgf Technical Data

A bow thruster delivers a side-directional thrust force. In order to ensure the best performance under all sorts of weather and water conditions, the bow thruster should be able to provide a thrust force that is suitable, or rather: sufficient, for the boat in which it has been installed. The applied moment of the thrust force – which means to say: the position of the tunnel in the bow – is of prime importance for the bow thruster’s efficiency. The further forward the bow thruster is positioned, the greater will be the efficiency. The force applied by the wind onto the boat is determined by the factors: wind speed, angle of wind attack, and lateral wind draft area of the boat.

The Wind Pressure

When the wind speed increases, the wind pressure increases quadratically!
For wind pressure ‘P’, the formula reads: P = 1/2?× V² (lbf/sq.ft) ? (rho) represents the specific mass of air and ‘V’ stands for the velocity of the air in ft/s.

The table below will give you an impression of wind speeds and the resulting wind pressures. It will not be possible to counter completely the adverse effect of winds of 40 knots or more. But, in such cases, the bow thruster will still “lend a strong helping hand”.

The Wind-Draft of the Boat
The forces applied by the wind onto the boat can be determined by multiplying the wind pressure by the wind draft area. The wind draft area is determined by the shape and dimensions of the superstructure. Also, the wind angle is playing its part. The worst situation is created if the wind is at 90 degrees to the boat. However, due to the shape of the superstructure, which is mostly more or less streamlined, a reduction factor may be applied to the wind draft area, before calculating the wind pressure resulting from the wind speed. This reduction factor may generally be set at 0.75.

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Reference: valin.com